Changes

If <code>what</code> is 0 or any invalid value, nothing is done.  

If <code>what</code> is 0 or any invalid value, nothing is done.  

If it is 1, <code>val != 0</code> is written to the global variable enabling register dumps on CPU exceptions (dumps that are fetched with svcGetDebugThreadContext) 

If it is 1, <code>val != 0</code> is written to the global variable enabling ERR:F-format register dumps on user-mode CPU/VFP exceptions. The function handling it reads fields from the faulted or the main thread's TLS and most often writes the data structure on the faulted thread's stack.

If 2, kernelpanic will be called when svcBreak is used by a non-attached process

If 2, kernelpanic will be called when svcBreak is used by a non-attached process